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1
Content available remote Coefficient of optimal structure in relation to wood density in Norway spruce (Picea abies Karst.) and Scots pine (Pinus sylvestris L.)
Jakubowski M., Jelonek T.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
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2012
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No. 78
97--103
EN
Coefficient of optimal structure in relation to wood density in Norway spruce (Picea abies Karst.) and Scots pine (Pinus sylvestris L.). The aim of these study was to verify whether there is a relationship between the visual image of macrostructure expressed by COS and wood basic density in spruce and pine. Analyses were conducted on wood of wind-broken trees of Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies Karst.). The coefficient of optimal structure (COS) shows high correlation with density in spruce and pine wood in the lower buttress section of the stem (at a height of 1.3 m - 4 m). Spearman’s correlation coefficients are around 0.7 - 0.8.In the upper part of the stem at a height o.
2
Content available remote Biomechanics of Scots pine (Pinus sylvestris L.) coming from mature stands
Jelonek T., Jakubowski M., Remlein A.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
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2012
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No. 78
124--129
EN
Biomechanics of Scots pine (Pinus sylvestris L.)coming from mature stands. This study presents an attempt at a determination of the effect of former farmland on biomechanical stability of trees by analyzing compressive strength, bending strength and basic density of wood. Analyses were conducted on wood of Scots pine grown on twelve locations coming from mature stands growing on former farmland and forest soils. Recorded results indicate significant differences in wood properties investigated in this study between the compared groups of trees. It was found that pines grown on forest soils were characterized by significantly higher values of parameters investigated in this study. Axial variation was also observed in all the discussed properties.
3
Content available remote An attempt at appraisal of softwood quality based on coefficient of optimal structure (COS)
Jakubowski M., Jelonek T.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
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2012
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No. 78
92--96
EN
An attempt at appraisal of softwood quality based on coefficient of optimal structure (COS). Visual characteristics of macrostructure may be simply correlated with different wood properties. There are some factors used to describes various macrostructure elements. In this work among selected parameters describing wood structure, a new parameter was propose. Parameter called the coefficient of optimal structure (COS) joint information on the proportions between early wood and latewood and on the mean width of annual rings. The described coefficient is easy to calculate and apply in the rapid analysis of softwood cross-section.
4
Content available remote Allometric stability indexes of stands growing on former farmland soils
Jelonek T., Jakubowski M.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
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2012
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No. 78
118--123
EN
Allometric stability indexes of stands growing on former farmland soils. The study consisted in an analysis of stability of trees growing on former farmland and forest soils on the basis of allometric indexes. Twelve mature pine stands growing on former farmland and forest soils were selected for the analyses. Pines coming from stands growing on soils typical of forest phytocenoses are characterized by slightly greater slenderness and their center of gravity is located higher than in pines growing on soils previously utilized by agriculture; however, it may be assumed that in terms of allometry the compared groups are similar.
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